Device for testing speedometers



Jan. 27, 1931. wlNNE 7 1,790,128

DEVICE FOR TESTING SPEEDOME'IIY'IRS Filed April 5, 1928 2 Sheets-Sheet l gwvwwtoz Luuz'fi fl- Mlinng I Jan; 27, 1931.' wlNNE 1,790,128

DEVICE FOR TESTING SPEEDOMETERS Filed April 5, 1928 2 Sheets-Sheet 2 Luuz's Minna atbozwufl Patented Jn.'27; 1931 v I, i

. LOUIS A. iw mnnpor wnmrreron, DEL WARE IDEVICE FOR rEsrINGsr EDomErERs Application med April 5,' 1928 Serial N6. 261,648].

This invention'relates to improvements in her '10,'which}is held in'rotatableposition by i machines and methods for testing speedommeans of a sleeve portion 11" properly threadeters without removing them from the autoed andadapted to be tapped-into a portion 12, i mobile -or other vehicle to which theymay extending from the frame member 6. The [be attached. v inner end of the shaft member is rotata- 4 object of this invention is to provide 7 blymounted in anaperture 13 of the eXtenan apparatus for testing speedometers with- 'si0n 12,' the aperture thereby functioning to out detaching them from the vehicleand at provideasuitablebearingin vwhich the shaft; the same time function to test the" accuracy 10'andthegear 9111943 revolve r of the entire speedometer equipment; thus The sleevemember 11 1s properly thread-, 6.9 I

V v 29 this application;

25' thereto. v

v Figure3r determining whether the speedometer head d and thefshaft'10-apertured,fas at114 "f is properly adjusted and whether the'speed ivil g he "e ndfif wflXible Sh f 15, 1f. ometer driving 'gears'of the vehicle are of andaTdma-ke, attached at the other endt the proper ratio to be used with the tire size a Speedometer 160'f the ordinary type used 1 V and the rear axle ratio of the vehicle; linhonn'ection vvith automobiles, as clearly-- Other objects of this invention will appear dlsclosed 1n Figures1and2 r from thefollowing detailed description of The frame members-5 and 6are'mouiited the device, as disclosed invthe two sheets-0f upon-wheellelements' 17 18', 19, and 20. 'A drawings which are herewith made a partof" Cable m r 11s attached to suitablefpon Inthe drawingso I" the rear end ofa-spring balance 22 :is1 at- Fig. 1 illustrates a side elevational view of t Fd h fi qflland brought-into op-i an automobile showing the speedometer testratmg m1 1 n$h1p Wltl1' a pulley 23, .by ing apparatus in assembled relationship j me ns Of a cable port1on24; extending there u i A over and having a number 'of'loop-portions' Fig. Qrepresents aportion of the 'instru- 5, formed iil'the free endIther eon; The pul-x ment board, disclosing the ordinary location: 2 1 ad p d to b hel In Suitable ref of'the speedometer of thevehicIe, andthe l t 'onshlpto a Whe 126 Of'the vehlcle master speedometer together with connec means-of'ahook 27 or 'any other adaptable) 7 tions leading therefrom; p device, as clearly disclosed in Figure 1; .80 Fig; '3 illustrates a 'plan'view oflthe testing "The lOwer i d" 0f the; fleXible ha is device, disclosing the relationshipbetwe n: connected wi'th the sleevefll and the'shaft the roller and the reduction ear. I P s' y c s 1n the r w ngs-a Y Fig. 4represents an endelevationalviewof dcscrlbed ab0ve5-wh1le the masterspeedome- Y V .7 ter 16 is connected toithe upper end of the In the'device for testing speedometers,- acflexible Shaft 5515 ly Shown 111 cording to this invention, numeral "1 desig- 11 m 2-7 i ii a Y p nates a; roller having a suitably formed In (fperatl iiyonebi herearjwheel 28 pi crown and rigidly attached to the shaft mema vehlcle 1s -3a0ked up, whilethe opposlte 01 her 2, bearingmembers 3 d h ld i rear WheeLmay-be blocked oriotherwise to erative relationship by means of frame mempreventa forward or backw rd motion z lfhe bers 5 and 6', which are connectedtogether r 1 1 ,m v p QQ -Wl ea in spaced relationship by meansof a'rweb whe' l 28gwh ethe k l fi 'J d'MI ,a .member 7 frame elements 5 and 6 being sothe front 'wheelr1m" 26, front:wheel spindle a placed that the roller 1 may revolve freely or'atany convenient P011113." a 4 t'herebetween.

-A spiral drive gear '8 is securely fastened until the spring scalel22 isstretchedftolia;

- to the-end' ofvthe shaft-member? and is pre-determined tensi0n','but notto 'the limits:

adapted to mesh with a spiral driven gear 9, of its'sc'ale'l One of the loops 25 inthe 'cable 1 rigidly mounted on a spindle or shaft mem- 24: is' placed r the h k29fih P f g The free end 30 or he -camels th enbunea;

are thrown into mesh in the usual manner,

and as the acked'up rear wheel 28 revolves,

7 it will function to drive the'm'aste'r speedometer 16 by means of roller 1, gears 8 and 9,

' and the flexible shaft 15,

A comparison of readings-bf themaster speedometer" l6 and the readings of the speedp the freedomof rotation of wheel nemberslT and the gears 8 and 9 are of suitablecorie spo-nding rat1o,'then the reading of the mas-v motion is takenoff at the circumference there of r disclosed at 32, it willridealong oneline ap proximately int-he center of the :tire, even though the center line of; the test machine and the center line of the vehicle be only approximately parallel. Qwing 'tothe resiliency of the spring of the; balan'ce 22v and 18, 19, and 20,,the roller 1 will remain con- 'stantly in contact with the tire irrespective,

of the eccentricities or irregularities in cir cumference of the tire. I; a V

.The device may be so constructedto fit the Widest the commonly used, while the cable; "241. may be provided with suflicient numberof loops 25, suitably spacejdflo accommodate the! test. machine .tovehicles of; various 'wheel bases and provide for various tachment-for the. hookr27.

without afiectin What I claimi's V I :7 v 1. In aspeedoineter tester for use in' connection with power driven vehicl'es,amaster;

the merits of this invention,

speedometer, adevice for registeringthe' master speedometer, comprising-aplurality of members actuated bycontactwith a move 111g portion of the vehicle, meansconnectingy. 7 said contact members with the vehicle 1n-" to bear between 'thev'ehicle andthej plurality J of members, a

members actuated bycontact with amovin' points o f atablyconnecte'd to a port-ionof the vehicle and I tothe contact members for'bringing tension t o bea r between the vehicle and the plurality a A of members,'the plurality ofmembers com-e ometer 31 of the vehicle maybe madeat all speeds. If the roller 1 isof proper diameter.

prisiriga roller element having a crown thereon and shaft. for rotatably supporting V the shaft.

terspeedometer 16 will be correct irrespeC- tive of'the diameter of; the tire, since thet. .In-a speedometer tester 01 use i in: jconnection with power driven; vehicles,- amaster speedometer, a device for registering the master speedometer, comprising aplurality,

of'members actuated by'c ontact with a moving portion of the vehicle, a spring adj ustably connected to a portion of the vehicle and to I the contact members for bringing tension to 9obear between the-vehicle andthe plurality of members,= the plurality of members comprising aroller element having a crown thereon 3 and shaft for rotatably supporting the roller,

a movableframe-for supporting the shaft, a"; sleeve portion extending from the frame, gearing mounted upon the shafts and in: the

sleeve portion:

In a speedometer tester for use in con nection w th power driven vehicles, a master speedometer, a device for registering the mas ter speedometer, comprising aplurality of portion of; thegvehicle, a spring adjustablyi,

, Y I connected to a portion of the vehicleand to 1 It is understoodth'at substitutionsand al-. terations may be/made in theiabovedisclo sure both in thespecificati-onand drawings [within the scope of the appendedclaime:

the contact members for bringing tension to bearbetween the vehicle and the plurality of members, theiplurality of members lcomprising a roller elementhaving a crown thereon and shaft-for rota'tably, supporting the roller, a movable frame for supportingthe shaft, a sleeve portiouextending*from the frame, gearing mounted uponthe shaftsjand.

in the sleevefportion, andconnecting means. from the ggearing to the masterspeedometer.

In testimony whereofI aliix my signature;

I .ZQ In a speedometertesterfor use'in con 

